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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebca01271fcf511090fb7b90bc39e3f243a79b6e35c37a7fe5965056bd0e0de3' 
  AND token = 'pcIwyvJ5YCHg/+blQ0/n0pS5wWJ0+f06SI3xHH0Ya4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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