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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314a950f991998f20fab70e889ed1bfd8233ae8b7bbfdb854232a6360f802fb4' 
  AND token = '0aEgl5byYAVTII8vNz5v5eiBRcgkmrstA63pFQIgBQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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