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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd56ae621f0444526332f7b9ec04ca9711eef5e9802b4eab84b13999e83099d' 
  AND token = 'Me4XUMLB8bh37NM3gljueerqNSufSU74glReN3TkR/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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