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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be22b319b58ea84e83f05820ae0ca1360bc51e3e716a21b973844c559beb64f' 
  AND token = 'hMnNVOidgfSDuNCh8jSl84esw2s5AqanCh0r2bGb7Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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