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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a493db78dbc7cd6f49962ff35b4af3c14648f038bcad2a0f06c5ca706e05cb' 
  AND token = 'Ua6QFL1YOQbyp5mzQeb63oyOM3iJ97wU1MDX5sJKf1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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