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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be9327fb7746e85dfcc6dde081502789b4fed1e27aeef6ad5a1c0ee4b94ac63' 
  AND token = 'JtrmZzdfqb4vI5Y4JPV3qwy5RKPDJNB0OzPMkkN3tX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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