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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04850882c46a26598702d54b2b6357c0c1693f75fa67c67ae099bf0c50959ee7' 
  AND token = '3Kx7oTA4lFysYnbOcPqvIOlhl0ZZ5KfYfSxInzfuHw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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