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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34967620f9de241c64ae69c0194900fe2decb9aadb5460dbd681b68d0451b81' 
  AND token = 'B4LQe7XK3XXdsFgxE7WHkJOa/CbcBpIK5AvW6lCkaUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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