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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7555c51ad8ef0db78397385585cd3b08237a35fc847fdcb53ab7d84753ebe43b' 
  AND token = '7PJCxWuQieUV886IOlvWEob8MpQ0Z9Xe7GTTRGcROik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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