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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25186b9e8b6711e7ba540c7dc0c5266432be3c066f7b6b35c95c122e858c7fb' 
  AND token = 'VbJW7IXtojQOBZw/pbxrNy8/SXI3GFXNAgOyu5DBaYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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