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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe71f9510f521c7959373172c8e8eba0fe6b2b173871f096713137b3ddf36aa4' 
  AND token = 'YM1+9L/YQRq81leRO8PasGvsVoTl8bGeI7baYh/aDCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}