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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d957c2906cc0932af931eb596bddf952b6c1ab93a1cd09b02f44b9fe4dbe03' 
  AND token = '6SdfoFTRWGg5LpoLrR3aDsW105unhv2LXUcxX9p2CDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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