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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98322188682ec61c4855268aac0a3febcb0317e2395d084296d8ef177f56bff' 
  AND token = 'wEBscpCC9rkbb3Qw7ucphIHGdpNmHjEB8Stvhco0dEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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