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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1760931f3af447bbeca9ac5dfcb59160cf040f5b7ca407491c51ec07b3cd5545' 
  AND token = 'fCKXtcwFoN7aQiW5cEWgtXKL8Zdb+tziOZo/QbMLp4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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