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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddec08ef1e42f21ff7c1de1dca32d0630ae37681a827fa8bd04d4d133a1cacb' 
  AND token = 'MNkQodQ++tku1EWiNyAAb850QGbbVCg5RUK+2Mfp8WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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