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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6741beef6beae8bfaa665c313df0d6ced24f32b127c7d3cee84698944425ca5' 
  AND token = '5QZsBFj6Dcq/zcpbKS9Eb5dXMRc3pwzp+KrPXCdOGO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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