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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65dc1eaeeb2ed47ab4a0ddb79648830cedcfa1cefaf114ca0b5b3407bd2fc4e' 
  AND token = '2UZI8PB1S1FwxG2AnllU/kPCbxs1LE1ivF9yxCdkewg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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