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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2cdac6f5a5dd98aef56bc3606eff61af9de0a10fca7ea8290845d4b94bf07d2' 
  AND token = 'QeO1Rfq2LBqnutI4Uz+3fT4EmtnIk4QCOc7nKGCc+f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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