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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90e6b01f5afeb804ad3ca25f1c10cf8d8490c7dd7bc985eaa1f9c8df63e04f6' 
  AND token = 'VVCE2xht1/edYtQZTNCyRKsx69yaypcp7CimRFO0Hxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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