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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129b559de1342551e5dde9f004bb60795a3e0b705f8316678d0cf6fb4bd775a6' 
  AND token = '23h4AgYnT7RrgpK4y2YC3YYD4brRuqryIu75C4Aoy1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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