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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07cdbd2d1fd3b2665e50e7a6a18941ab279276b2525c50f08ff2ce2dcbf7fbc3' 
  AND token = 'ivfxynvCGBhWbQoE4nhK3rzjB5fLNBmY7jj681DZqNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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