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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93eb1897eaee2cbd93bbb47f4f462b4f9b1d78bde77de04bdf65212e6cf90e89' 
  AND token = 'sepYxW6fU1q8RseXK1cwBYjXIr2bicGOkHnbn0W2SQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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