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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e971f7031ab4a3734f639efa1713b7110e61645ac6d63237bb76ef7262e453' 
  AND token = 'kZyvBM3AU9QeYTxBt0U0vDHjY7ViZGPORfKLJUfEj0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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