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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf4031fc75feec90b1c246aa7937529a85c6a44e087f0ad0e74e38620d28221' 
  AND token = 'U462RV098CCPkBIcYY/2FqKxO0ZZmXVYLHlkqJNbUn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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