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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47d655aab987351d0ce96a1fdb41368639943d750eaf0633c8e5643a37e82bc' 
  AND token = 'b5l5WBMP/34uB/TvN1UFNc2/p4YQA+3zfnroFs+HLIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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