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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7e346fc1f72e1f6648f09b477f84ab4de9108fd11a455921637a5ae0f7f59b' 
  AND token = 'inS1FQD1SRY6Eg67iPRo3DBrmIAIGRF5ov06RNVDZlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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