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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae59f40a0d09ec6b4556302d6a844265fb0c3e10b6eb27e594a2b40a9569f74' 
  AND token = '57580uJPcmRf2RBQpRmaYLyn70AZnkeQjlGkp+GUJRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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