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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfbebe7580aa0d8558ac76bb4ace64a6ad8de5540ff8f05acec6e9dc61f025c' 
  AND token = 'lTbT4MKee2pVpP3XrG2MUm+Al12Sa1iH0QdQJcC3n1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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