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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf75d7d00525d00ff2e7d281e2fc7924022595ba4e3b20e9c4f3904ed834702' 
  AND token = 'ghIgxJjPIjTDxCj7svJnBnU0VVk+6ciydEVdql8qy2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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