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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b563495a3b59c5bf984acbeff35e1b95958b4d8ac9b4927c5a1d702b461306' 
  AND token = 'jL4Dwz292KKugv45LZnNgrDVuL2AYNOg/2juSKj61ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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