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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d305fc8b31e27f990e6bfe38d8e0ed64614fdd7f8e0090f4d8f786fde09a0d' 
  AND token = 'K17EBPtV/Z0Wm1n9zLA11V/D59O9nB7cs2Cqpv76ySA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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