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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79e05e34aaa258c82535e7d13f48ad880053c5ab45d28147f9a0fb63b8d8f71' 
  AND token = '8U1MWR+Oqvq36NGsFmO4GhRmRk759CDC9/sl5Mqc5rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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