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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e01956e8b62a681ff5db01b45a775e5753609cd93bfcb14476a8e24fdb3415f' 
  AND token = 'oQyHdHo2p3xCuv/v6+iS7HlkmOugSbqfEvgRDpVS3I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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