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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9415b63b5c723f93bea56960179c034838be67ea138254f60658de193e7da3' 
  AND token = 'z1Rb+J7mu0SlbKZc5ZJU6ukf0zR6PFp4CPRumRNA3V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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