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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98383b29765e959234dbc56f7e3a61d93ebbb9f74d6c68d865d3fa6c20dfc0f7' 
  AND token = 'QavzCSoaTDY2sEtRigejNyywgM84cCUHNQgGcOIOZ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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