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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26fa52e4db128c2c0e5b66bb6fb1449380966ec9d022fafff4794bb529d2055' 
  AND token = 'WLEIs2dQSc74Z/5ks2OIcOAydWtI5uVd5pNl90hr5z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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