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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b2b74b816f41424de2d1abaa77986825d4039d60dbf26b4086220cfefb18fb' 
  AND token = 'ali4G6+c9aXSRh79dDCIFIO41veEy5V1lXeAFSk3qK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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