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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7155358ea678a4cfabf4e1ae643103c5bdbd87daca36eae4484e2e3ac58fc29c' 
  AND token = 'MLhTL/KsNnXE3VtysIvivI5Hlv8UuZuFbdxgQnS81zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00143

JSON explain

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