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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66797f69d25e07ddd2b47f47a1946c2e7617139f2115268f250e950fb6005c99' 
  AND token = 'W5xXrj10UZ9kWgdkz46wVn6I+b5Cmt/LndzThLA3/8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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