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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4d86705ad87fee3ce9a42fffb8df5d1f3c7d5a0ac69fde6915c2d292d038dc' 
  AND token = '0oqN661k1gdR+U+7/W00nrv9NvnojF0sxWpbj/ccuSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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