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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239dd7c98c73cc68306a14d8408ea4c67a01e63a0f5da5216ecadee13dcfb426' 
  AND token = '5Rutg2ZA3ABKmSVNIxWDIoj3vzcl5sL3JykuRyRbPFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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