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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acf4f1528ac429b60c4bc56a913ec477f884dea055e3a316dbe0d64111e16c8' 
  AND token = 'Lr9r1ubdDX5Mg4p7C6WK9LE/o6wKCHFcca8ZgcNh0OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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