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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57a702df070d3c78a3e1139ca19c844221114abb8aa492c4077b33f050fa8f8' 
  AND token = 'Oe53Wo9KQYaaM4gsi2GiO0yE7zgBf0aaIsVNck7ypJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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