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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268697aa4421385fa103ad0c99779461bb7b4bb3be7a8e95903ba3717b6568ce' 
  AND token = 'ImsGjSDMNgN7rOIes2tXbF1pEeD1j2vELVtQ2+WAhLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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