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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93a4e13fad3c5d171f40d150ddb30368e7155df0c7a4bd3ea88dc238a0a3d12' 
  AND token = 'bi+RALFGdMbf8HG5tJcKVXjHZxrmCrIxKyyrrjWGhD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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