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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88339a52e94f43cc1fa68e1d65b67438663bccfdd95c5c1464361010e4277251' 
  AND token = 'lcrMQ/QG/ng4E3/2I1hQHPirOpa+ceVdtPE1PgE86ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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