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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1516612b836ce202492bda0e5c752f2c7d4c0de7e184838cd193706913ff4538' 
  AND token = 'VV9WA7QHVwl3ebOzKfJ0owbnt2aWjsxr6BoHwuNwvDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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