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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710a1a172148903468b43c5a8200abf4cb290fffd0cb86c21432c1262fc7cb03' 
  AND token = 'S9qiGp73X/dbSgDnsJhd/UJc1IFkyYZETMs/eTbVy7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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