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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0234566f7332857d5a4ea9df910ad5e4f8c3276e9f53c17caf8e7d431f2caa00' 
  AND token = 'LyLdMCd+56w94kWrijrfafYISlZ20xZQuQ/ppuD/4H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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