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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85289b08f58fdba8a93d2d8b040830df1d035604e2d60a9fc689fb3c38965270' 
  AND token = 'MXNlJVqEmnSerO7sJucOmHhXoykqrid5L5dBpN9KLDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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