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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed9687cbb6b87a82c719ded8b306e7aba614456804ea08a5854fb7ed27e37c8' 
  AND token = 'mI/72Mr0jWaNIGAA//OSoIHGPlW+tqhujG/74gr3mbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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