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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa7cfe4a0186539c9ce8d107c7dd7acb05a1a2cb4115b6a7a81fca674e4832a' 
  AND token = 'KXjCYkBSLGPJNrgQ2tW2aI1P4HNAus8slcFfnKFCkpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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