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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e932fbec7c3fb4a65ab940133e1600c925fe48dc6eeda741fb3124d43c0c8b' 
  AND token = 'qRAk7zbR81FCYAuRD+7hTeD0yOnDJXVZfyaJfdpSKPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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