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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8b79fb05bf9a04f50797a248403642fadbaec7465991086397775e278e469d' 
  AND token = 'vb6U+q6TZPruJlusr8oao/h4wrtd2CnfzjtopuJvi9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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