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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3919f05d13c8919bfd5ff05d110f8fd1858d1e16ef8fae25545ae4bdc358a9d' 
  AND token = 'YudwhP47ehzuFNX0Z7qiTV2f07GbywyMBgmfQrweslk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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