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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec9b21754df8ae433dada32aa5b79adaeb54190a783a5ad445fe6538b3b5ed4' 
  AND token = 'azSJlIfOKpegHzJ/iyv6UoqnB49tsunPG5JemC7EKVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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