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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ba53e5859857c8bb4d0e1fd1da66a38af49982e1a5e86feb3cdb3dc3cb80be' 
  AND token = '4ZvU0aeJVeZSgkZPk0gA/R9gs1w7vajHPq4hcIPqHC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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