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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f9a5e6b9cbbf6cae19b241e8bd7d842abccf81ea5867ce7b273f6c94a1a520' 
  AND token = 'hQfYEvt+Q1eU1nc7bbv7ycEsJRyvVG4GfFLIoFrgnqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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