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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b991e3229b02dd9a6ac8fc30f5238264637b837aeb1686cac85e63a9acb301' 
  AND token = 'BLF3bjobTOMmV4iTx/yE/1p/n8GSOxhJKNaRomwKzJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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