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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a04ef5ace5c981462cf1111309dd52c5d4a3849c4b66ea355d220232b2cd1a6' 
  AND token = 'W2txFVMjiUlj3plvgarnMdWNhOkFF2bBAIYIWngtORk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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