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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97a26ace28ccb630edcee936d77483315849be3cb49f583d32ea4f9f39e44c7' 
  AND token = 'xz6APC0mcBc9VxaUNgiJJuiaM2CRrv6D+KGwE+4VieI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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