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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb2f3d1725e1daa04339997648272c4bb0cba5f51bb51d4560efb8d67560351' 
  AND token = 'nDDq/56jPNwQea/jhqBtjI6/3rzamciwTS9dPCM5ENo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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