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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9b596221d9e7bddafddc9b4292e7c6a951a51fd5a19ab426f66580ce1c5824' 
  AND token = '9sNynknd+vnT5Ttx0Z1R5nIKcOkFXH0xvun0O3gYQiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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