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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3ecc6714225ef6b63e512fca5e67ed48f84586fbeed0c4ebf1c1642de40f4b' 
  AND token = 'mWQgxNkM4jSCeQyUF18Sy+DgWhm3SvW/fvjD1/+ko1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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