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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505736e8a3bb136278fee6749b5ab54dfac4813d109d2237c53796992944cacc' 
  AND token = 'GvaLW7m22lcZEkXP2FWYMcMWi84h3VyEs/juMogaGiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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