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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3050ed20107377c9809ce767c5eb329e9e46950ca785684f53249879e4d7fe28' 
  AND token = 'gaHl20459b+L4Q7blCeDZMaadsnV/eyc4o5v/XXWPto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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