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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1934a05c55c9a6a7361ef4b37c5fd5c3213c6455288e7e9402a540bddc63b093' 
  AND token = 'yDwETkHqZ950ZHyqwRSxuVlA76WFRxw83A5tll/nFDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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