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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0655cbf6aae3ec1e5240ad7b2519fd7e034ea711bd5bd48b808f9621adaa402f' 
  AND token = 'ZGLszTyS9eV+SZK6eTCov2zGOti88AOSPq5hv4VMWtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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